Ignition condenser



P 3, 1929. L. F. CURTIS ET AL IGNITION CONDENSER Filed Feb. 13, 1928Les/1': paw? 75/ 0 F Marx/ 7 BY; m ATTORNEY Patented Sept. 3, 1929.

UNITED STATES,

PATENT OFFICE.

. ,d\ LESLIE I. CURTIS AND JOHN F. MARTIN, OF SPRINGFIELD,MASSACHUSETTS, AS-

SIGNORS TO AMERICAN BOSCH MAGNETO CORPORATION, OF SPRINGFIELD, MAS-SACHUSETTS, A CORPORATION OF NEW YORK.

IGNITION CONDENSER.

, Application filed February 13, 1928. Serial No. 253,991.

This invention relates to condensers, and more particularly to' ignitioncondensers for use in timers for combustion engines.

The object of this invention is to provide a condenser which iscompletely enclosed and sealed, and in which the terminals are incapableof rotation. 1

Our invention consists in providing a cylindrical condenser-havingflexible-leads which are connected respectively to the shell in whichthe condenser is placed, and a terminal 'insulatively mounted on saidshell.

that the flexible leads were broken and the con- One of the principalfeatures of this invention is the construction of a seat for one of theterminals of the condenser so as to provide a water-tight joint withoutthe use of solder.

Heretofore, it has been the practice to enclose the condenser in ashell, but instead of the terminal being mounted on said shell, it wasmounted on one endof the condenser, and the termial was exposed throughan opening in said shell. It was therefore sometimes possible to rotatethe condenserin said shell by turning the terminal with the resultdenser in other ways damaged. Further, the opening in the shellpermitted air, moisture to get into the shell to affect adversely theintegrity of the condenser. In some cases the terminal was also turnedindependently of the condenser, making a proper exteiinal connection bymeans of a screw diflicu t.

By our construction, we have so enclosed the condenser in the shell thatno air, dust or moisture can penetrate the shell, and secondly, fixedthe terminal on the shell so that no rotation is possible.

The preferred embodiment of our invention is illustrated in theaccompanying drawings, in which M.

Fig. 1 is a top view of th shell;

Fig. 2 is a bottom view ofitpwe shell; and

Fig. 3 is 'a longitudi 1 cross section through the complete conde ser.

Throughout the drawing like reference characters indicate like parts.

The shellis composed of two telescoping sections 1 and .2. into whichthe condenser 3 is snugly enclosed. The bottom of the shell 2 hassoldered to it aperforated attaching plate gt and the shell 1 haspassing through it a tudust and p l is preferably of hexagonalconstruction.

The edge of the top of the shell 1 is flattened, 14, 14, and between theflattened portions of the shell is placed the washer 7 having, as doeswasher 6, a similar conformation to the flattened area of the top of theshell. This construction prevents the washer 7 from rotating withrespect to the shell and, hence, also, the terminal 5.

In order to prevent rotation of the terminal, the neck 10 of theterminal is forced into the hexagonal opening in the washers 6, 7, as byspinning. J g x The condenser is provided with a flexible lead 11 whichis soldered to the bottom of the condenser and is brought up along theside of the condenser and over the edge of the shell 2, when it isfinally soldered between the overapping portions of the shells, or theinner shell alone.

Another flexible lead 12 is soldered to the upper end of the condenserand the lead passed through the opening in the terminal 5. A leaddisposed in said opening so that a firm electrical contact shall be hadbetween the lead 12 and the terminal 5.

The end of the lead 12 should be completely covered by the lead seal orplug. The plug may be put in place by forcing into the threads a smoothended steel screw which expands the lead plug over the end ofv the wire,hermetically closing the ioint.

Wrapped around the upper portion of the condenser and disposed betweenit and the shell 1 is a sheet of paper 15 having a margin 16 whichextends beyond the condenser and folds over it.

It will be observed that due to the polygonal construction of theopening in the top of the shell 1 and the peening over of the bottom ofthe screw, the terminal is incapable of rotation or movement in and out,and secondly, that due to the cooperation of 17 between the shells 1-and 2 is soldered.

Having described our invention, what we claim 1s:

1. A condenser caslng comprlsing a shell,

a flattened peripheral area on said shell, in

sulating washers coinciding with and mounted on the flattened section,and a terminal mounted thereon.

. 2. A condenser casing comprising a shell, a flattened peripheral areaon said shell,'in sulating washers coinciding with and mounted on theflattened section, and a terminal between which the washers andflattened area are securely held.

3. A condenser casing comprising a shell, a flattened peripheral area onsaid shell, polygonally apertured insulating washers coinciding withanddisposed on either side of the flattened section, and a terminalinsulatively mounted on said shell securing the,

washers to the flattened area.

' 4. A condenser casing comprisinga shell,

a flattened peripheral area on'said shell-, po-' lygonally aperturedinsulating washers coin ciding with and disposed on either side of theflattened sections, and a tubular terminal insulativelv mounted on saidshell securing the washers to the flattened area.

5. In combination, a cylindrical condenser, a casing therefor comprisinga shell, a flattened peripheral area on said shell, poly onally'apertured insulatingwashers coinciding with and disposed on either sideof the flattened section, a tubular terminal insulatively mounted onsaid shell, securing the washers to the flattened area, and a lead pluginserted into said terminal ensealing a lead wire from the condenser andhermetically sealing the condenser. Y

6. In combination, a cylindrical condenser,

a casing therefor comprising a shell, a flattened peripheral area onsaid shell, p'olygonally apertured insulating washers coincid- 1 ingwith and disposed on either side of the flattened section, a tubularterminal, insulatively mounted on said shell, securing the washers tothe flattened area by peening over the lower end of the terminal, theterminal being also provided with an opposing shoulder, and a lead pluginserted into said terminal ensealing a lead wire from the condenser andhermetically sealing the condenser.. I

In testimony whereof I aflix my signature.

' LESLIE F. CURTIS. In testimony whereof I afiix my signature.

JOHN F. MARTIN.

